Just an idea. There is a whole bunch of space forward of the forrward tank bulkhead. You could put 30-40 gallons there, probably more and the boat likes weight forward.

They give you a price? Moeller he some that might fit longitudinally but I am not sure how they would go in.

Also using the space forward isn't a bad idea, I guess I would have to install a hatch, but that's not rocket surgery.

heres the email from them
We have a 34 x 33 x 7.25 that is 36 gallons $164
We also have one that is 30 x 18 x 14 29 Gallons (this tank is not designed with a sending unit) $116

Not sure how low in the bilge you can go to fit this, but maybe it might fit.
$90- it is worth a look. Once it stops snowing and I pull a tank, I will see how much depth there is to be had.
http://greatlakesskipper.com/product...-gas-tank.html

too tall I believe, I have one of My old tanks out I can measure, Ill go by and post the dimensions later today. Its shaped similar to this tank with the beveled corners on the bottom , both tanks had corroded completly through half way up the sides where the wet foam was , heres a photo of how bad mine looked,

I have to look, but I think there was room in the vee under mine. Seeing as those are narrower but deeper, the might squeeze in between stringers? At $90, I thought I would look. Truck freight from that place is ~$220 to Boston. They have lots of tanks there.

Surplus from Maverick boats. Most of their inventory is surplus from various mfgs.

I had a friend measure mine at the shop, he said they are 34x29x 12.5 tall not counting the filler neck on the top, so 15.5 with the fittings .Mine were foamed in with about an inch if foam between them and on eiher end. The floor under them was flat with the top of the stringers, and thats how I rebuilt it. those look like they are very close to fitting!! Im gonna go by the boat today and do some measureing to see.

Hey Strech, Just my 2 cents worth. To me a gas tank is where you don't cut any corners. I understand keeping the cost as low as you can go, especially since I'm a cheap poor bastard and do the same, however be real careful on any used tank. The way I look at it, a water tank might be just great using 16 ga aluminum, not a gas tank, spend the extra and go with 14 ga to maybe even 12 ga for larger custom tanks. Good luck!!

If you want to pursue the forward tank idea, look at the pics posted by Blue Heron, Strick and me to get an idea of the space available. I think you would need to do it as a two tank side by side install because of the width of the access.